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Photocatalytic Site-Selective Cascade Radical Addition of Biaryl Ynones for the Construction of Spiro-and Fused Carbon Rings

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Chinese Journal of Chemistry 2024年第14期42卷 1599-1605页

作者： Kairui Liu Chunhang Zhao liji Gu Xiang Li Jiali Yan Siqi Lao Weiwei Huan Yan Zhang Key Laboratory of the Ministry of Education for Advanced Catalysis Materials and Drug Discovery&Innovation CenterCollege of Chemistry and Materials ScienceZhejiang Normal UniversityJinhuaZhejiang321004 China Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass College of Chemistry and Materials EngineeringZhejiang A&F UniversityHangzhouZhejiang311300 China

Functionalized free radical addition/cyclization reactions represent an efficient way for introducing new functionality or coupling fragments to *** are good regional selectivity radical acceptors in organic synthesis,and many of bio-relevant cyclic compounds could be easily obtained by direct radical cyclization ***,we report a photocatalytic cascade radical addition of biaryl ynones,for the divergent synthesis of privileged carbon ***,further transformation of the multi-functional group product into a variety of other derivatives demonstrates the synthetic value of this developed method.

关键词： Ynones Photocatalysis Cascade cyclization Alkoxycarbonyl radical Dearomatization Biaryls Regioselectivity Radical reactions

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播音主持人提高亲和力的策略探究

艺术科技 2024年第12期37卷 146-148页

作者：张李继桐梓县文化馆贵州遵义563200

目的:基于新媒体的迅猛发展以及受众需求的多元化,文章探讨播音主持人提高亲和力的策略,以增强节目吸引力与观众黏性,从而更有效地传播信息。方法:文章采用文献综述法、案例分析法和实证研究法,首先阐述亲和力的内涵与特点,然后重点分... 详细信息

目的:基于新媒体的迅猛发展以及受众需求的多元化,文章探讨播音主持人提高亲和力的策略,以增强节目吸引力与观众黏性,从而更有效地传播信息。方法:文章采用文献综述法、案例分析法和实证研究法,首先阐述亲和力的内涵与特点,然后重点分析亲和力在播音主持中的具体作用,提出播音主持人提高亲和力的具体策略。结果:研究表明,较强的亲和力对信息传递具有显著的正向影响。亲和力强的播音主持人往往更容易获得受众的信任和喜爱,从而更有效地传递信息,在提升节目收视率的同时,增强受众黏性。研究还发现,通过适当的训练,播音主持人可以在一定程度上提高自身的亲和力。结论:亲和力是播音主持人必备的素质,不仅能够提升播音主持人的专业形象与受众对其的接受度,还能增强传播效果。为了培养和提高亲和力,播音主持人要注重情感表达、肢体语言、声音特质等方面的训练,并在日常工作中不断积累经验,增强与受众互动的能力。未来的研究可以进一步探讨如何量化亲和力,以及如何更系统地训练播音主持人的亲和力。

关键词：亲和力播音主持人作用

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机组协调控制系统低碳寻优策略研究与应用

电力系统装备 2024年第3期 95-96,110页

作者：郑立极浙江浙能温州发电有限公司浙江温州325000

文章介绍了660 MW机组协调控制系统,分析了该系统的特性与面临的挑战。基于低碳经济的理念,文章设计了针对660 MW机组的低碳寻优策略,并对其进行了评估与优化。最终成功将低碳寻优策略应用到实际机组中,并取得了显著效果。

关键词： 660 MW机组协调控制系统低碳经济

MIP FORMULATIONS AND HEURISTICS FOR SOLVING PARALLEL BATCHING PROBLEMS

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Journal of Systems Science & Complexity 2010年第5期23卷 884-895页

作者： Udo BUSCHER liji SHEN Chair of Industrial Management Department of Business Administration and Economics Dresden University of Technology ( Technische Universitaet Dresden) Dresden 01062 Germany.

This paper addresses the scheduling problem involving batch processing machines, which is Mso known as parallel batching in the literature. The presented mixed integer programming formulation first provides an elegant model for the problem under study. Fhrthermore, it enables solutions to the problem instances beyond the capability of exact methods developed so far. In order to alleviate computational burden, the authors propose MIP-based heuristic approaches which balance solution quality and computing time.

关键词： Batching decisions mixed integer programming scheduling.

Analysis of fault detection method based on predictive filter approach

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Science in China(Series F) 2005年第3期48卷 335-353页

作者： liji ZHANGHongyue SchoolofAutomationScience&ElectricalEngineering BeihangUniversityBeijing100083China

A new detection method for component faults based on predictive filters together with the fault detectability, false alarm rate, missed alarm rate and upper bound of detection time are proposed. The efficiency of the method is illustrated by a simulation example of a second-order system. It is shown that the fault detection method using predictive filters has a small delay, a low false alarm rate and a low missed alarm rate. Furthermore the filter can give accurate estimates of states even after a fault occurs. The real-time estimation provided by this method can also be used for fault tolerant control.

关键词： fault detection nonlinear systems predictive filters false alarm rate missed alarm rate detection time.

Synthesis and Thermal Properties of a Novel Nitrogen-containing Epoxy Resin

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Chinese Chemical Letters 2005年第4期16卷 547-550页

作者： XingHongZHANC HongMeiWAN YuQinMIN ZuoFANC guorongqi InstituteofPolymerScience ZhejiangUniversityHangzhou310027

A new nitrogen-containing epoxy resin (XT resin) was synthesized from chain extension of xylenephenolformaldehyde resin (XPF) and triglycidyl isocyanurate (TGIC) in the presence of base catalyst. FT-IR and H-NMR analysis confirmed the chemical structure of XT resin. It was 1 cured with dicyandiamide (DICY) and diaminodiphenyl sulfone (DDS). Dynamic mechanical analysis (DMA) results showed that the introduction of triazine ring provides epoxy polymer with good thermal stability. Furthermore, high char yields at 800℃ in thermogravimetric (TGA) analysis indicated that XT resin had potential flame retardance.

关键词： Nitrogen-containing epoxy resin xylenephenolformaldehyde resin (XPF) triglycidyl isocyanurate (TGIC) thermal stability.

Regional cerebral metabolic changes after acupuncture by FDG PET: effects and methodology

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Nuclear Science and Techniques 2002年第4期13卷 224-229页

作者： GUANYi－Hui liji 等 PETCenter HuashanHospitalFudanUniversityShanghai2000235 DepartmentofChineseTraditionalMedicine HuashanHospitalFudanUniversityShanghai200040 PETCenter HuashanHospitalFudanUniversi

In order to investigate the therapeutic mechanisms of acupuncture points in cerebrovascular ischemic patients and normal volunteers, FDG PET was adopted. Changes in cerebral glucose metabolism and cerebral functional activity before and after electro-acupuncture treatment were studied in 12 normal volunteers and 11 cerebrovascular ischemic patients. The PET imaging was read by visual interpretation and calculated by semi-quantitative analysis. After acupuncture, cerebral glucose metabolism of the normal group is higher in the frontal lobe, temporal lobe, thalamus bilaterally and cerebellum contralaterally. The cerebrovascular ischemic patients had manifested greater response in their lesions than in their normal regions of the two tested groups, as well as than in their normal regions of the whole brain, after acupuncture treatment. The study shows that the regulatory effects of acupuncture on the central nervous system influence the brain at multiple-sections, multiple-directions and multiple-levels of brain function. Itconforms to the holistic and bi-directions regulatory laws of acupuncture.

关键词：正电子发射造影脑葡萄糖代谢物针灸

阻塞性睡眠呼吸暂停综合征患者困难气道评估的研究

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实用医学杂志 2024年第10期40卷 1460-1466页

作者：黄佳黄浩贤陆立基盛恒炜佛山市三水区人民医院耳鼻喉科广东佛山528100 佛山市三水区人民医院麻醉科广东佛山528100 佛山市中医院麻醉科广东佛山528100

阻塞性睡眠呼吸暂停综合征(obstructive sleep apnea hypopnea syndrome,OSAS)是常见的睡眠呼吸障碍疾病,易导致上呼吸道狭窄、舌体后坠、低氧血症等解剖及生理的改变。OSAS是引发麻醉困难插管的常见原因之一,准确评估此群体的困难气道... 详细信息

阻塞性睡眠呼吸暂停综合征(obstructive sleep apnea hypopnea syndrome,OSAS)是常见的睡眠呼吸障碍疾病,易导致上呼吸道狭窄、舌体后坠、低氧血症等解剖及生理的改变。OSAS是引发麻醉困难插管的常见原因之一,准确评估此群体的困难气道对预防围术期不良事件发生有重要意义。目前困难气道的评估手段多样,评价不一,本文就OSAS困难气道的各类评估方法进行综述,总结困难气道预测的新趋势,帮助麻醉医师进行准确的术前评估。

关键词：阻塞性睡眠呼吸暂停综合征插管预测

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新加坡华文女作家孙爱玲的中国叙事

楚雄师范学院学报 2024年第2期39卷 79-84页

作者：张浬源洪丽霁云南大学文学院云南昆明650091 楚雄师范学院语言文化学院云南楚雄675000

孙爱玲作为新加坡华文女作家代表之一,其小说叙事以强烈的文化原乡情感为根基,总体风格承载着悠长的古典意味,呈现着中国文学的经典性特征。深入探究孙爱玲小说中国叙事的分类和叙述功能,我们发现,孙爱玲小说叙事的特征包括根植中国古... 详细信息

孙爱玲作为新加坡华文女作家代表之一,其小说叙事以强烈的文化原乡情感为根基,总体风格承载着悠长的古典意味,呈现着中国文学的经典性特征。深入探究孙爱玲小说中国叙事的分类和叙述功能,我们发现,孙爱玲小说叙事的特征包括根植中国古典诗词两大滥觞——《诗经》《楚辞》的文学传统,对古典传奇、话本、戏文叙事结构和内容的借鉴,以及融合中华文化现代转化的整体营造等三个方面。

关键词：孙爱玲中国叙事新加坡华文文学